Peak flow meter



FIG. 1 is a top, front and left side perspective view of a peak flowmeter showing my new design;

FIG. 2 is a bottom, rear and right side perspective view;

FIG. 3 is a left side elevational view, the right side elevational viewbeing identical thereto; and,

FIG. 4 is an inverted front elevational view thereof.

FIG. 4 has been drawn on a reduced scale with respect to FIGS. 1-3.

The ornamental design for a peak flow meter, as shown and described. 